Hourly Weather | Today Thursday, May 21, 2026
Stamford, Connecticut
12 PM
Rainy Weather
61°
Feels Like 57°
81
Humidity: 77%
UV Index: 2
Wind: 8 mph
1 PM
Rainy Weather
61°
Feels Like 61°
73
Humidity: 73%
UV Index: 3
Wind: 7 mph
2 PM
Rainy Weather
61°
Feels Like 63°
65
Humidity: 71%
UV Index: 3
Wind: 6 mph
3 PM
Rainy Weather
61°
Feels Like 63°
65
Humidity: 70%
UV Index: 2
Wind: 6 mph
4 PM
Cloudy Weather
61°
Feels Like 63°
49
Humidity: 69%
UV Index: 2
Wind: 6 mph
5 PM
Cloudy Weather
63°
Feels Like 63°
46
Humidity: 69%
UV Index: 1
Wind: 6 mph
6 PM
Cloudy Weather
61°
Feels Like 63°
49
Humidity: 69%
UV Index: 1
Wind: 6 mph
7 PM
Rainy Weather
61°
Feels Like 57°
54
Humidity: 72%
UV Index: 0
Wind: 5 mph
8 PM
Cloudy Weather
57°
Feels Like 57°
5
Humidity: 84%
UV Index: 0
Wind: 5 mph
9 PM
Cloudy Night
57°
Feels Like 57°
2
Humidity: 87%
UV Index: 0
Wind: 5 mph
10 PM
Cloudy Night
55°
Feels Like 55°
2
Humidity: 90%
UV Index: 0
Wind: 4 mph
11 PM
Cloudy Night
55°
Feels Like 55°
2
Humidity: 91%
UV Index: 0
Wind: 4 mph

Hourly Air Quality Forecast - AQI (US EPA)

12 PM
27 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.88 µg/m³
  • PM10: 4.33 µg/m³
  • O3: 0.029 ppm
  • NO2: 9 ppb
  • SO2: 1.5 ppb
  • CO: 0.15 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

1 PM
28 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.11 µg/m³
  • PM10: 4.16 µg/m³
  • O3: 0.030 ppm
  • NO2: 8.4 ppb
  • SO2: 1.2 ppb
  • CO: 0.15 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

2 PM
28 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.53 µg/m³
  • PM10: 4.41 µg/m³
  • O3: 0.030 ppm
  • NO2: 7.8 ppb
  • SO2: 1 ppb
  • CO: 0.16 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

3 PM
28 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.98 µg/m³
  • PM10: 4.77 µg/m³
  • O3: 0.030 ppm
  • NO2: 7.8 ppb
  • SO2: 0.9 ppb
  • CO: 0.16 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

4 PM
28 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.32 µg/m³
  • PM10: 5.07 µg/m³
  • O3: 0.030 ppm
  • NO2: 8.3 ppb
  • SO2: 0.9 ppb
  • CO: 0.16 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

5 PM
28 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.4 µg/m³
  • PM10: 5.13 µg/m³
  • O3: 0.031 ppm
  • NO2: 8.5 ppb
  • SO2: 0.8 ppb
  • CO: 0.16 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

6 PM
29 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.34 µg/m³
  • PM10: 5.08 µg/m³
  • O3: 0.031 ppm
  • NO2: 8.8 ppb
  • SO2: 0.8 ppb
  • CO: 0.16 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

7 PM
27 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.32 µg/m³
  • PM10: 5.14 µg/m³
  • O3: 0.030 ppm
  • NO2: 9.6 ppb
  • SO2: 0.7 ppb
  • CO: 0.16 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

8 PM
26 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.25 µg/m³
  • PM10: 5.16 µg/m³
  • O3: 0.028 ppm
  • NO2: 9.8 ppb
  • SO2: 0.7 ppb
  • CO: 0.16 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

9 PM
25 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.09 µg/m³
  • PM10: 5.08 µg/m³
  • O3: 0.027 ppm
  • NO2: 9.1 ppb
  • SO2: 0.7 ppb
  • CO: 0.16 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

10 PM
25 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.94 µg/m³
  • PM10: 4.95 µg/m³
  • O3: 0.027 ppm
  • NO2: 8.2 ppb
  • SO2: 0.7 ppb
  • CO: 0.16 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

11 PM
25 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.93 µg/m³
  • PM10: 4.91 µg/m³
  • O3: 0.027 ppm
  • NO2: 7.3 ppb
  • SO2: 0.6 ppb
  • CO: 0.15 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.